Preparation and Performance Evaluation of Imidazoline Corrosion Inhibitor

An imidazoline corrosion inhibitor was synthesized from diethylenetriamine and oleic acid using dimethylbenzene as a water carrying agent.The optimized parameters for the preparation were obtained,when the molar ratio of oleic acid to diethylenetriamine was 1∶1.4,volume ratio of dimethylbenzene to react agents was 1∶ 5,reaction temperature was 145-210 ℃,reflux time was 8 h,the yield was up to 96.5%.The corrosion inhibition efficiency on carbon steel was over 90% with imidazoline derivative concentration of 20 mg/L in boiler solutions．